Installing tool for assembling hydraulic lash adjuster bodies of diesel engines



p 10, 1963 c. F. PHILLIPS ETAL 3,103,053

INSTALLING TOOL FOR ASSEMBLING HYDRAULIC LASH ADJUSTER BODIES OF DIESEL ENGINES Filed Oct. 22, 1958 2 Sheets-Sheet 1 INVENTORS llllqgllllll I i 1 I I fizzy/0rd .EP/Yzi/Zpa 2 5 6. JiaZzZ, (fr.

,L BY

\ ATTORNEYS Sept. 10, 1963 Filed Oct. 22, 1958 C. F. PHILLIPS ETAL INSTALLING TOOL FOR ASSEMBLING HYDRAULIC LASH ADJUSTER BODIES OF DIESEL ENGINES 2 Sheets-Sheet 2 INVENTORS GZi/ford 17 fifiz'iizj s Patsy 61 $2712? ,0):

BY Mark M? 1 57 MW ATTORNEYS United States Patent 3,103,963 INSTALLING TOUL FOR ASSEMBLING HY- DRAULIC LASH ADJUSTER BODIES 0F DTESEL ENGHNES Cliflord F. Phillips and Posy G. Stultz, .lrx, Roanoke, "V2,, assignors to Charles M. Oiioyle, Wilmington, Del. Filed (let. 22, 1958, Ser. No. 768,873

. 1 Claim. (Cl. 29-244) The present invention relates to installing tool for assembling hydraulic lash adjuster bodies of diesel engines.

A type of valve bridge to which the invention is applicable is that illustrated in US. Patent No. 2,380,051, granted July 10, 1945, to E. W. Kettering, in which the valve bridge is equipped with two hydraulic lash adjusters which engage the exhaust valve stems of the engine for opening the exhaust valves on downward movement of the bridge pursuant to a rocker arm action.

Such illustration as is contained in the present application may be identified with respect to the value bridge and hydraulic lash adjusters by the same reference numerals as employed in said patent.

It is to be understood at the outset that the valve bridge including the hydraulic lash adjusters is removed from its upright position in the engine and inverted to be placed upon a servicing and testing tool or implement which forms the subject matter of our copending application entitled Servicing and Testing Device for Valve Bridges and Hydraulic Lash Adjusters of Diesel Engines, Serial No. 768,871, filed October 22, 1958, and now Pat. No. 3,039,- 300.

llncident to the cleaning, servicing and testing of the hydraulic lash adjusters, the same are removed from the valve bridge and a tool for removing the lash adjuster bodies or shells from the bridge for this purpose is the subject matter of our copending application entitled Lash Adjuster Body Pulling Tool for Diesel Engines, Serial No. 768,87 2, filed October 22, 195 8, and now Pat. No. 3,04l,71l.

It is an object of the present invention to provide a device for reassembling the lash adjuster bodies or shells to the bridge in which they engage by a pressed fit, and to achieve this purpose and result by a simply constructed and simply operated tool which will operate efficiently and quickly in cooperation wtih the bridge as the same is held upon the tool of the first above-mentioned copending application.

It is another object of the invention to provide a tool for the purposes stated which will be of few parts, of rugged construction and developing direct thrust for driving the body into its pressed fit in the bridge.

A still further object of the invention resides in providing an installing tool which is constructed to take advantage of the form of the valve bridge to the end that the reactive thrust may be borne by the bridge while the plunger of the improved tool is driven by cam action against the hydraulic lash adjuster body or shell.

With the foregoing and other objects in View, the inven tion will be more fully described hereinafter, and will be more particularly pointed out in the claim appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views:

FIGURE 1 is a side elevational view of a form of valve bridge according to the prior patent aforesaid, to which a form of installing tool according to the present invention is applied in a position of actually driving the hydraulic lash adjuster body into its recess in the valve bridge;

'FIGURE 2 is a similar view but with the parts in an initial position of application before the power is applied to the cam lever;

FIGURE 3 is a side elewa'tional exploded view of the aliases Patented Sept. 10, 19fi3 paglts of the improved installing tool taken on an enlarged sc e;

FIG. 4 is an end elevational view of the same;

FIGURE 5 is also an end ele-vational view of the tool assembled;

FIGURE 6 is a side elewational View of the tool in assembled form, and

FIGURE 7 is a side elevational view on a much magnified scale with parts broken away and parts shown in section of a form of plunger which may be employed.

Referring more particularly to the drawings, in FIG- URES 1 and 2 a form of valve bridge 38 is illustrated having lash adjuster bodies or shells 42 with outwardly extending flanges 42, as shown in the right-hand end of FIGURE 2 where the improved tool is positioned in readiness to drive the body 42 downwardly into the bridge 38.

This tool comprises generally three parts, 81, 82 and 83, of which 81 is a yoke or stirrup, 82 a plunger, and 83 a cam lever.

As shown more particularly in FIGURES 3 and 4, the stirrup or yoke comprises the cross bar 84 and two side bars 86, 86. The cross bar 84 at one free edge between the side bars '85, 85 has a projecting beveled edge 87 for facilitating entry of the tool over the valve bridge into the positions of \FIGURES 1 and 2.

The sidebars 85, 86 at their upper ends are formed with bearing openings 88 to receive therethrough a pin 89 upon which the handle 83 is rotatably mounted through bearings 99. As shown in FIGURES 3 and 4, these openings are made in the lower end of the handle 8-3 where the handle is forked or bifurcated into the spaced legs 9:1, 92. As shown in FIGURE 4, these legs 91, 92 of the handle '83 are formed with bosses 9'3, 94 externally thereof and surrounding the bearing openings 9% to form wear plates or spacers for engaging the inner surfaces of the side bars 85, '86 of the stirrup for a minimum of frictional contact incident to the partial rotation of the handle 83.

The bearings or bosses 9-3, 94 position the plunger 82 in a central position bet-ween the side bars 85, 86 so that the plunger 82 may move freely up and down between such side bars.

This plunger 8-2 is suspended from an upstanding web 95 having a diagonal slot 96 therethrough (FIGURES 3 and 7) for the reception of the pivot or fulcrum pin 39. As shown particularly in FIGURE 5, the web 95 is received in the space between the bifurcated legs 91, 9-2.

The legs 91, '92 are formed with cam or eccentric edges 97 which are adapted to turn upon shoulders 93, 99 on the top surface of the plunger -82 at opposite sides of the web 95.

Referring more particularly to FIGURE 7, the bottom surface of the plunger 82 is formed with a depressed or upwardly offset seat 106 for engaging the bottom surface of the flange 42' (top surface when inverted). This offset seat 100 is embraced Within a marginal downwardly extending rim 101 having an internal diameter to fit snugly over the external part of the flange 42' of the lash adjuster body 42, as more particularly seen at the righthand end of FIGURE 2. This construction 100, 101 may be accomplished by counterboring the lower face of the plunger approximately of an inch. Such arrangement requires that the tool be centered upon the lash adjuster body so as to center the thrust of the tool upon the body.

As also shown in this FIGURE 7, the plunger 82 is provided with a central recess 102 opening downwardly through the seat 10%), this being for the purpose of receiving the hydraulic lash adjuster plunger (not shown but numbered 44 in the prior Patent 2,380,051 aforesaid). This is of importance when the body 42 and plunger are installed as a unit. This recess or bore 102 is of substantially greater depth than is necessary to receive the plunger,

the additional cavity space being for the purpose of reducing weight from a manufacturing standpoint.

The beveled projecting edge 87 on the yoke acts as a positioning stop for the yoke against the end of the support 80.

The elongated slot 96 in the web 95 of the plunger is disposed on an angle instead of being in line with the axis of the plunger, this being done so that the point of contact of the cam will remain in the center line of the plunger when the cam handle is moved in a downward stroke.

In the use of the tool, the hydraulic lash adjuster body or shell 42 is dropped'into the recess in the bridge provided for the same. The tool is then assembled to the bridge and to the valve body 42 by first swinging the stirrup 81 about the pivot 89 in a counterclockwise direction with reference to the position of FIGURE 2, this being done by hand so that the stirrup is out of the way of the plunger 82 which is then centered over the hydraulic lash adjuster body 42 and lowered thereon into an operative position with the rim 101 enveloping the outer portion of the flange 42' while the offset seat 160 of the plunger 82 rests directly upon the lower face of the flange 42 (upper face in' the inverted position of the bridge). The yoke 81 may then be released or permitted to drop down in a clockwise movement with its edge 87 leading to permit the lower cross bar 84 to assume its position beneath the valve bridge. This is the position of FIGURE 2, the handle 83 being in the elevated position with the low points of the cams 97 resting on the cam follower surfaces 98-, 99. Thereafter the handle 83 will be pulled down from the position of FIGURE 2 to that of FIGURE 1 causing the cam edges 97 to ride around on the cam follower surfaces 98, 99 in a driving movement for driving the hydraulic lash adjuster into its pressed fit in the bridge.

After driving the hydraulic lash adjuster body 42 home, the handle 83 is rotated back to elevated position of FIG- URE 2 and the cross bar 84, thus being released, tends to drop by gravity below the lower part of the bridge, whereupon the stirrup 81 is swung by hand outwardly clear of the bridge 38 which enables the plunger 82 to be lifted by the handle 83 oif the valve bridge 38.

During the operation of shifting the lever from the vertical to the down position, there is a shift in space or position of the pivot pin 89' (compare FIGURES 1 and 2). The slot 96 in the web 95 of the plunger 82 is inclined in the direction of this shift so that as the pivot pin 89 is elevated by the cam or eccentric action and shifts out of the axial line of the plunger 82, such pin is accommodated in the diagonal slot 96 whereby the thrust of the cams. on the follower surfaces of, the

plunger 82 are enabled to remain in the true axial. line of the plunger 82, resulting in a downward drive of'the plunger 82 in a direct axial line upon the body 42 for driving the body in a true rectilinear line into its pressed fit in the recess of the bridge. This avoids any canting or cocking of the valve body which would or might result in a jarning of the same in the recess wall.

The pin 89 acts to hold the plunger captive thereto while allowing of relative movement between the plunger 82 and the stirrup cross arm'8-4 because it will be understood that in effect the angular movement of the handle 83 will cause the parts 82 and 84 to move together, the one upon the hydraulic lash adjuster body and the other beneath the bridge. The reactive force is accordingly taken up by the bridge 38 while the thrust of the plunger 82 becomes effective to drive the hydraulic lash adjuster body into its pressed fit within the recess of the bridge 38.

Incident to the movement from FIGURE 2 to FIG- URE 1, the stirrup or yoke may rock on its cross bar 84 as an axis through a small angle due to the movement of translation of the pin 89.

The above mode of operation is that recommended for simplicity and quickness of operation. It will, of course, be understood that it is possible in the raised position of the handle 83 to lift by hand the plunger 82 through the lost motion of the slot 96 and to then introduce the stirrup 81 in the first instance over the bridge 38, the plunger 82 being raised to clear the flange 42 after which the plunger may be dropped in place and the handle 83 operated as heretofore, or the plunger 82 may be rotated out of the way about the pin 89 while the stirrup 81 is first introduced about the bridge 38, whereupon the plunger 82 may be swung about the pivot 89 to a position within the side bars 85, 86 and dropped in place on the valve body 42, 42.

Viewing FIGURE 2, it will be seen that the cross bar 84 of the stirrup is spaced beneath the lower portion of the valve bridge 38 while the plunger seats upon the flange 42'. The parts will seek these positions by gravity. Hence when the handle 83 is rotated from FIGURE 2 to FIGURE 1, it will first elevate the stirrup until its cross bar 84 comes in contact with the immovable bridge 38. Further movement of the cams will then develop downw nd movement upon the plunger 82. Consequently it may be said that the cams or operating means drive the cross bar 84 and the plunger "82 in opposite directions toward one another.

Should the handle 83 in the position of FIGURE 2 be held elevated so that the cross bar 84 is at the inception of the movement in engagement with the bottom of the bridge 38, and held in this elevated position while swinging down to the position of FIGURE 1, the stirrup would:

be at all times immovable and the only movable member would be the plunger 82.

The projecting beveled edge 87 of the cross bar 84 leads in assembling the stirrup to the valve bridge 38 which facilitates the engagement due to the inclinationof the bevel. The projecting portion also actswas a positioning stop striking against the support indicated atdotted lines in FIGURE 2, which is a part of the tool of our copending application first-mentioned above.

Although we have disclosed herein the best form of the invention known to us at this time, we reserve the right to all such modifications and changes as may come within the scope of the following claim.

What we claim is:

For use in reassembling a hydraulic lash adjuster body into its pressed fit in a recess in an end portion of a valve bridge in which the bridge occupies an inverted position on a support with the recessed end projecting beyond the support, a tool comprising (a) a cam lever,

(b) a stirrup having (c) spaced side bars (d) pivoted at one end portion to the cam lever and adapted to swing into and out of position straddling the projecting end portion of the valve bridge at the sides of the recess, said stirrup also having (e) a cross bar connecting the other end portions of the side bars and adapted to extend below and into engagement with the lower part of the projecting end portion of the valve bridge,

(1) said cross bar having a' projecting beveled edge for facilitating entry of the stirrup over the valve bridge and for acting as a positioning stop against the support, and

(g) a plunger adapted to occupy a position above the hydraulic lash adjuster body, said plunger also (h) pivoted to the stirrup and having (1') bodily movement with respect to the stirrup and lever and having (j) at least one cam follower surface positioned to while the cross bar abuts the underside of the valve bridge.

References Cited in the file of this patent UNITED STATES PATENTS Tappen Sept. 16, 1941 6 Lindroth Dec. 1, 1942 Schneider July 4, 1950 Belpedio Apr. 10, 1951 Sunnen May 26, 1959 FOREIGN PATENTS Great Britain July 22, 1926 Sweden July 5, 1927 

